Air cleaning and sound-silencing apparatus



Aug. 11, 1936. F, s, QREM 2,050,581

` AIR CLEANING AND SOUND SILENGING APPARATUS Filed Oct. 5, 1932 ,2Sheets-Sheet 1 '26' l vl 12 24 v I@ gn/wmf 13 Eli'l'zpnerm,

MQMMMM yf @Moz/W4 Aug.11l936 F. s. oREM 2,050,581

AIR CLEANING AND SOUND SILENCING APPARATUS Filed oet. 5, 1932 2Sheets-Sheet 2 Patented Aug. 1'1, 1936 AIR CLEANING AND SOUND-SILENCINGAPPARA TUS ' 'Frederick simmer om. Baltimore, 1Mo. application october5, 1932, smal No. $36,402

3Claims.

This invention relates to apparatus for illtering air and for silencingsound, which apparatus is particularly suitable for-attachment'to theair intake oi a carburetor of an internal combustion 5 engine.

An object of the present invention is to provide a device adapted to'beconnected to the air intake of a carburetor of an internal combustionengine, which functions both as a iilter to lter the air before it isdrawn into the carburetor by the suction of the engine, and as a meansfor silencing carburetor noises and noises from the engine, which latternoises pass backward through the manifold of the engine to the airintake of the carburetor.

Another object of the present invention is to provide a device that willnot become clogged and will not require cleaning.

A further object is to provide a device which,

2o when employed for silencing carburetor and other noises passingthrough the carburetor, will in no way interfereV with the freel flow ofair through the carburetor to the engine.

A still further object is to provide a combined air-filtering andsound-silencing device that is compact, simple in-construction, andinexpensive tomanufacture. p l

To these objects and such other as may hereinafter appear, the inventioncomprises features of construction and arrangement oi' parts`hereinaiterdescribed and particularly pointed o ut in the appended claims. ,l

In the drawings Figure 1 is' a vertical cross sectional view of theapparatus showing the relative positions of the air-iiltering means andof the sound-silencing means;

Figure v2 is a cross sectional view on line 2-2 A of Figure 1 in thedirection of the arrows; and

Figure 3 is a cross sectional view on line 3-3 of Figure 1 in thedirection of the arrows.

' The apparatus of thepresent invention comprises an air-filteringchamber having an outer side wall I, and an upper wall 2 providedwith anopening 3 communicating with a sound-silencing chamber 4. y

'Ihe outer wall is preferably. cylindrical in shape. Within theair-filtering chamber, formed by said wall, are a plurality ofvertically disposedv 0 cylindrical 4ltering Ameans, which cylindricalmeans arenested within each other and spaced apart. In the drawingsthree such cylindrical nltering means, namely, 5, 6, and 1, are shown.Each of these means comprises a wire mesh screen 8 and'illteringmaterial, such as a felt layer 3, snugly iltting against the screen. Thefiltering material on the outer cylinder 5 covers the entire screenportion of the cylinder, with the exception of one or more rows ofmeshes at Ythe upper end of the cylinder. This leaves an annular openingat this point, the area of which is substantially the same as the area.of the opening leading from the appliance into the carburetor. 1

'I'he entire wire screen material of cylinders 6 and -1 is covere`d withltering material.

'I'he upper ends of the cylinders 5, 8, and 'I are held in place on thewall 2 in any suitable manner. The lower end of the cylinder 5 rests onthe upper end of the wall of a cup shaped element I0. 'I'he lower end ofthe cylinder 6 comprises a solid baille wall I I which extendsdownwardly part way into the cup shaped element I0. Within the cupshaped element' I0 is a tubular member I2 which extends partly into theair-filtering chamber, and 15 is in alignment and communication with anair outlet I3 extending from an opening in the bottom oi the cup shapedelement I0. The lower end of the solid baille wall II is spaced from thetubular member I2, and from the wall of the 20 Acup shaped element I 0.The area of the annular opening at X between the bottom edge of -thebaille II and the wall I2 is preferably substantially equal to theareaof the opening left inthe uncovered portion of the screen 5. Theannular chambers I4, I5, and I 6, formed by the iilteringmeansconstructed as described, provide, therel fore, for the freepassage of air through the said annular chambers as well as through thescreen adjacent the upper end of cylinder 5 when pass- 30 ing from theannular chamber I4 into the annular chamber I5 and also into the lowerend of the cylinder 6 when passing from the annula chamber I 5 into theannular chamber I6.

The inner cylinder 'I forms an unobstructed central passage I1 whichcommunicates at its lowerl end with the tubular member I2 and at itsupper end with the opening 3, which leads into' the sound-silencingchamber 4. The opening 3 comprises preferably a short, tubularstructure, the upper end of the wall of which ares outwardly into thechamber '4, as at- I8. u

The sound-silencing 'chamber 4 may be any desired shape, and the wallsthereof are lined with thick layers of sound-silencing material I9, such45 as felt. Separate felt layers may be placed on the upper, lowerand-side walls of chamber 4 as' shown. The felt layer on the side wallmay be provided with metal edges I 9a and I9b which extend around thewall in the form of rings and serve to hold the `felt firmly in place.y

Sound wavestravel axially from the vintake of the carburetor andenterthe coaxially disposed silencing chamber 4 which has` its inlet 3axially' in line with the opening receiving the soundA waves and whichhas a closed annular space surrounding the said axial opening.

A tie rod 2|, :which serves to hold various parts -of the device inposition when assembled, extends through the top 20, a sleeve.22,'aspider 23 down- (i0 tached to the air intake of a carburetor (notshown). When the engine is operated, air is sucked in through theopenings 28 provided at the lower end of the annular chamber i4.

The porosity and area of the walls of the filtering elements are suchthat sufficient air will pass through the said walls and the filteringaction will take place. The outer cylinder 5 intercepts most of thedust. The pulsations in the air currents passing through the filteringmaterial assist in dislodging dust that collects on the surface of thematerial. Dust dislodged from cylinder 5 falls through the openings 28.

Any clust in the air passing through space 29 will be separated from theair and fall into the cup shaped element lll from which it may beremoved by opening the shutter 26. The member il serves as a bame toretard any dust that may be carried to this point by the air fiow sothat this dust will deposit at the bottom of the appliance for removalthrough the end discharge opening 25.

Spaces 29 and X supply any additional air that may be required bythecarburetor. There is no interference with thejfree' ow of air from inletto outlet of the devic';

In the annular "chamber l5, the air-takes a generally downwardlydirection, some of it passing through the filtering material on cylinder6, and the rest of it passing around the lower edge of the wall Ilupwardly into the annular chamber I6. The air then passes through thefiltering material on cylinder 1.

The air taking the various paths indicated by the arrows, receives itsnal cleaning by passing through the felt layer of the cylinder 'lwhereupon the air is drawn through the central passage Il into the airintake of a carburetor of an engine. Any dust not removed by cylinders 5and 6 respectively, which function both as filters and bafies, isremoved by innermost cylinder l, and falls into cup shaped element l0.

'The so-called carburetor noises are due generally to the rush of airthrough the air intake and to sound waves generated in the manifoldsystem of the engine. By means of my device, these noises are silenced.The silencing is effected to some extent both by the various filters andby reversing the direction of the air currents, as shown. However, thegreater portion of the sound in the passage ll leaving the intake of thecarburetor travels in a direction parallel to tl'ie'v l. Apparatuscomprising a chamber having end Y walls and side wall, an opening in anend wall adapted to be connected to the air intake of a carburetor, aplurality of air-,filtering walls in the said chamber concentricallyarranged around a passage formed by the innermost of the saidairflltering walls and leading from the said chamber to said air intake,an intermediate air-filtering wall of said concentrically arranged wallshaving a free end, a solid terminal baiile extension attached to thesaid end of the said intermediate wall around the free edge of whichbaille extension air can freely pass, the outermost of said filteringWalls having a second solid terminal extension beyond the end thereofforming a cup-like member into which said first named extensionprojects, and the air ltering wall forming the said passage beingcompletely closed with filter material through which all required airnormallly passes without interfering with the free passage of air to thesaid air intake, and a second chamber closed to the atmosphere andconnected to the said passage and provided with a lining ofsound-silencing material.

\2. Apparatus comprising walls forming a chamber provided with a liningof sound-silencing material covering the entire wall space, the saidchamber otherwise closed to the atmosphere, having an opening, a closedtubular filter communicating at one end `with said opening and at theother end with the air intake pipe of a carburetor, the said closedfilter being completely covered with filter material of such dimensionsand porosity that all required airA for the carburetor freely passestherethrough unimpeded, and a plurality of additional tubular filtersoutside of and coaxial with said inner closed iilter and providing anopen annular circuitous air pas- 1 sageway leading to the outside ofsaid inner closed filter to enable free flow of required air through oraround said-.additional filters, the said inner and outer lters togetherwith the open circuitous passageway being capacitated to remove dustfrom the unimpeded required air supply to the carburetor, and to deadenany sound from the carburetor not completely deadened by said linedchamber.

3. The combination in a combined air filter and sound silencer, of dustextracting means comprising an inner closed tubular filter communicatingwith an opening to the carburetor, anda plurality of tubular filtersoutside of and coaxial with said inner closed filter and providing anopen annular circuitous air passageway leading to the outside of saidinner filter, said annular circuitous air passageway passing around thealternate opposite ends of said outer filters and beine substantially aslarge in total area at its smallest point as the area of the inletopening to the carburetor, said inner closed filter being constructedramsarcrr sans 1;

